Originally Posted by
KenF
I think the problem here is that from what I can glean from what you wrote, you didn't have a stopover in NRT - if that is right then I fear that the DL staff may have been technically correct....
They were 100% wrong, full stop.
But, I fear that, as far as Delta is concerned, DTW-x-NRT-PVG-DTW, is equivalent to DTW-PVG-DTW, and is not allowed as a TWOV (after all, you can do an international connection at NRT and never enter Japan, so you would never have actually involved a third country).
As far as China is concerned, the routing is Japan-China-USA. They don't care (AT ALL) whether or not the OP actually entered Japan.